“It’s to really dredge up some of the old childhood memories.
“Whether that’s for the book or documentary, I don’t know.
“I know a lot of people have been saying to him, ‘why are you going back over this old brand? Why are you digging all of this up again?’
Prince Harry has sparked “concern” among his childhood friends over his memoir
Harry’s highly anticipated memoir, billed as a book of “raw, unflinching honesty”
“I think those closest to him in the UK are slightly concerned about how far he’s going.
“Now whether he puts all of that in the book of the doc, I don’t know but he’s certainly been doing a lot of childhood research.”
He added: “The questions he’s been asking have been raising a number of eyebrows.”
It comes as Harry has been warned he could lose a huge payout if he “dampens down” attacks against his family in his memoir.
The prince received £17.5million of the £35million book deal which includes four books, one to be published later this year.
But the Duke “has thrown a spanner in the works” by trying to change some of the stories in the book.
Royal expert Robert Jobson revealed Harry has to “own every word” in the book.
“The narrative whatever way you look at it, if people disagree then you’ve got a problem because it’s going to be down as the narrative for William and his father.
“He’s not even done a Diana, Her True Story because she could say it was written by Andrew Morton. This was written by him.
“I don’t know if he can dampen it down because if does then the amount of money he’s been paid the publishers might turn around and say, we don’t want to pay you the rest.”
Source: EXPRESS CO UK